The heater is operated by three sliding controls attached to the instrument binnacle. Two of the controls regulate the temperature and air flow distribution. The third control operates the two speed heater blower. The heater blower operates with the ignition switch in position "I".
Operation
Feed from the positive battery terminal is connected to the engine compartment fuse box (C632-1) by a brown wire. Current passes through fusible link 2. Fusible link 2 (C907-2) is connected to the ignition switch (C028-1) by a brown wire.
With the ignition switch in position "l", power flows through the ignition switch (C099-1) to fuse 5 (C580-9) of the passenger compartment fuse box by a white/orange wire. Fuse 5 (C580-10) of the passenger compartment fuse box is connected to the blower fan motor (C846-3) by a purple/green wire. When the blower control is in the off position, the blower motor has no route to earth and does not run.
Moving the blower control to position "l", connects the blower motor (C846-2) to the blower switch (C058-2) on a green/yellow wire. Power flows through the blower motor and resistor to the blower switch (C058-2) and to earth (C058-3) on a black wire. The blower fan operates at low speed. Moving the blower control to position 2, connects the blower motor (C846-1) directly to the blower switch (C058-1) on a green/slate wire, and to earth (C058-3) on a black wire. The blower fan now operates at high speed.